Check Burner Flame; Check Flame Signal - Weil-McLain Ultra 3 series User Manual

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gas fired water boiler
Annual startup

Check burner flame

The boiler contains ceramic fiber materials.
Use care when handling these materials per
instructions on page 93 of this manual. Fail-
ure to comply could result in severe personal
injury.
1. Inspect flame through observation window using the
procedure on page 36.
2. If flame is unsatisfactory at either high fire or low fire,
turn off boiler and allow boiler to cool down. Then
remove burner and clean it thoroughly using a vacuum
cleaner or compressed air. Do not use compressed air to
clean burner if performed inside a building.
3. To access the burner, remove the heat exchanger cover
plate following the procedure beginning on page 109.
4. When replacing burner, ensure gasket is in good condi-
tion and correctly positioned. After tightening the three
retainer screws, bend up the retainer tabs as shown in
Figure 107 to prevent screw rotation.
5. Reattach the cover plate using the method given in
Figure 113, page 110 or Figure 115, page 111.
6. After servicing, reinstall boiler components. Retest
boiler.
Figure 107
Burner assembly
96
— Boiler Manual
(continued)

Check flame signal

1. Navigate to Diagnostics/Inputs on the U-Control display (see
Figure 102, page 86). The flame signal value must be at least 20
above the Shutdown values given in Figure 106.
Figure 106
NOTE: "HA" means high altitude, 5500 feet or more above seal level.
2. If the flame signal drops to less than 20 above the Shutdown
values, the U-Control will attempt to correct by increasing the
boiler firing rate to increase flame signal.
3. A lower flame signal may indicate a fouled ignitor or damaged ig-
nitor insulation. If cleaning the ignitor does not improve, ground
wiring is in good condition, and ground continuity is satisfactory,
replace the ignitor.
Flame signal shutdown values
Model Shutdown
Ultra – flame signal
80 95
80 HA 95
105 135
105 HA 135
155 80
155 HA 80
Model Shutdown
Ultra – flame signal
230 100
230 HA 100
299 130
299 HA 130
399 120
399 HA 120
Part number 550-100-090/0809